Q41 / 220 · NTA Abhyas (NEET) 2020 · Chemistry · Ionic Equilibrium

For two weak acids A and B, the ratio of their percent ionization is 4:9. The ratio of their K_a would be-

A
4:9
B
2:3
Correct answer
C
16:81
D
3:2

Solution

K_{a} \propto c α^{2}

∴ \frac{K_{a_{1}}}{K_{a_{2}}} = \frac{α_{1}^{2}}{α_{2}^{2}}

= \frac{4^{2}}{9^{2}} = \frac{16}{81}

Hence, the correct answer is option: 'C'.

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